Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.303.43-3.44
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
None, may show partings on {0001} and {10 1 1}
None Observed
Mohs Hardness
66.5-7
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references